Enhancing text-like edges in digital images

Details Enhancing text-like edges in digital images Enhancing text-like edges in digital images

2003-09-30

2008-10-07

Kassa, Yosef (Department: 2624)

Image analysis

Image enhancement or restoration

Edge or contour enhancement

C382S260000, C382S269000, C382S274000, C382S275000, C358S003260, C358S003270

Reexamination Certificate

active

07433535

ABSTRACT:
Systems and methods of enhancing text-like edges in digital images are described. In one aspect, pixels in a block of image pixels are segmented into first and second pixel classes. The pixel block is edge enhanced in response to a determination that the pixel block likely contains at least one text-like edge based on a measure of distance separating intensity values respectively representing intensity distributions of the first and second classes and based on measures of peakedness of intensity histograms computed for both the first and second pixel classes.

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Ricardo L. de Queiroz et al., “Optimizing Block-Thresholding Segmentation for Multilayer Compression of Compound Images,” IEEE Transactions on Image Processing, vol. 9, No. 9, Sep. 2000.

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